EP 0767250 A3 19971229 - High strenght heat resisting cast steel, steam turbine casing, steam turbine power plant and steam turbine
Title (en)
High strenght heat resisting cast steel, steam turbine casing, steam turbine power plant and steam turbine
Title (de)
Hochwarmfester Gusstahl, Dampfturbinengehäuse, Dampfturbinenkraftwerk und Dampfturbine
Title (fr)
Acier coulé thermorésistant à haute résistance mécanique, carter pour turbine à vapeur, centrale à turbines à vapeur et turbine à vapeur
Publication
Application
Priority
JP 21704795 A 19950825
Abstract (en)
[origin: EP0767250A2] A steam turbine has main components such as rotor shaft exposed to high temperature and intermediate pressure, which are made of a ferritic steel and the main steam temperature and the re-heat steam temperature are 610 DEG C to 660 DEG C, and a steam turbine power plant employs the turbine. Further, the rotating blades are made of only a martensitic steel or a combination of the martensitic steel and a Ni base alloy, the turbine rotor is made of a ferritic forged steel having a creep rupture strength at the operating temperature for 100 thousands hours of above 15 kg/mm<2>, and the casing is made of a ferritic cast steel having a creep rupture strength at the operating temperature for 100 thousands hours of above 10 kg/mm<2>. The ferritic cast steel of the casing contains, in weight percentages, C of 0.06 to 0.16 %, Si of not more than 1 %, Mn of not more than 1 %, Cr of 8 to 12 %, Ni of 0.1 to 1.0 %, V of 0.05 to 0.3 %, Nb of 0.01 to 0.15 %, N of 0.01 to 0.1 %, Mo of not more than 1.5 %, W of 1 to 3 %, B of 0.0005 to 0.003 %, O of not more than 0.015 % and the remainder of Fe and inevitable impurities. Its method of manufacturing features normalizing at 1000 to 1100 DEG C, rapid cooling and tempering twice at 550 to 750 DEG C and at 670 to 770 DEG C.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/54 (2006.01); F01D 25/24 (2006.01)
CPC (source: EP KR US)
C22C 38/001 (2013.01 - EP US); C22C 38/22 (2013.01 - KR); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); F05B 2220/301 (2013.01 - EP US)
Citation (search report)
- [XY] CA 2142924 A1 19950823 - HITACHI LTD [JP]
- [Y] US 4764225 A 19880816 - SHANKAR SRINIVASAN [US], et al
- [EX] EP 0759499 A1 19970226 - HITACHI LTD [JP]
- [XY] EP 0639691 A1 19950222 - TOSHIBA KK [JP]
- [XY] EP 0427301 A1 19910515 - SUMITOMO METAL IND [JP], et al
- [Y] EP 0188995 A1 19860730 - MITSUBISHI HEAVY IND LTD [JP], et al
- [XD] PATENT ABSTRACTS OF JAPAN vol. 095, no. 008 29 September 1995 (1995-09-29)
- [X] DATABASE WPI Section Ch Week 9507, Derwent World Patents Index; Class M27, AN 95-049294, XP002039431
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0767250 A2 19970409; EP 0767250 A3 19971229; JP H0959747 A 19970304; KR 100414474 B1 20040531; KR 970010998 A 19970327; US 5961284 A 19991005
DOCDB simple family (application)
EP 96113393 A 19960821; JP 21704795 A 19950825; KR 19960035110 A 19960823; US 70170196 A 19960822